net/mac80211/pm.c

   1 #include <net/mac80211.h>
   2 #include <net/rtnetlink.h>
   3
   4 #include "ieee80211_i.h"
   5 #include "mesh.h"
   6 #include "driver-ops.h"
   7 #include "led.h"
   8
   9 static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
  10 {
  11         if (ieee80211_request_sched_scan_stop(local))
  12                 return;
  13         cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy, 0);
  14 }
  15
  16 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
  17 {
  18         struct ieee80211_local *local = hw_to_local(hw);
  19         struct ieee80211_sub_if_data *sdata;
  20         struct sta_info *sta;
  21
  22         if (!local->open_count)
  23                 goto suspend;
  24
  25         ieee80211_scan_cancel(local);
  26
  27         ieee80211_dfs_cac_cancel(local);
  28
  29         ieee80211_roc_purge(local, NULL);
  30
  31         ieee80211_del_virtual_monitor(local);
  32
  33         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
  34             !(wowlan && wowlan->any)) {
  35                 mutex_lock(&local->sta_mtx);
  36                 list_for_each_entry(sta, &local->sta_list, list) {
  37                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  38                         ieee80211_sta_tear_down_BA_sessions(
  39                                         sta, AGG_STOP_LOCAL_REQUEST);
  40                 }
  41                 mutex_unlock(&local->sta_mtx);
  42         }
  43
  44         /* keep sched_scan only in case of 'any' trigger */
  45         if (!(wowlan && wowlan->any))
  46                 ieee80211_sched_scan_cancel(local);
  47
  48         ieee80211_stop_queues_by_reason(hw,
  49                                         IEEE80211_MAX_QUEUE_MAP,
  50                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
  51                                         false);
  52
  53         /* flush out all packets */
  54         synchronize_net();
  55
  56         ieee80211_flush_queues(local, NULL, true);
  57
  58         local->quiescing = true;
  59         /* make quiescing visible to timers everywhere */
  60         mb();
  61
  62         flush_workqueue(local->workqueue);
  63
  64         /* Don't try to run timers while suspended. */
  65         del_timer_sync(&local->sta_cleanup);
  66
  67          /*
  68          * Note that this particular timer doesn't need to be
  69          * restarted at resume.
  70          */
  71         cancel_work_sync(&local->dynamic_ps_enable_work);
  72         del_timer_sync(&local->dynamic_ps_timer);
  73
  74         local->wowlan = wowlan;
  75         if (local->wowlan) {
  76                 int err;
  77
  78                 /* Drivers don't expect to suspend while some operations like
  79                  * authenticating or associating are in progress. It doesn't
  80                  * make sense anyway to accept that, since the authentication
  81                  * or association would never finish since the driver can't do
  82                  * that on its own.
  83                  * Thus, clean up in-progress auth/assoc first.
  84                  */
  85                 list_for_each_entry(sdata, &local->interfaces, list) {
  86                         if (!ieee80211_sdata_running(sdata))
  87                                 continue;
  88                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
  89                                 continue;
  90                         ieee80211_mgd_quiesce(sdata);
  91                         /* If suspended during TX in progress, and wowlan
  92                          * is enabled (connection will be active) there
  93                          * can be a race where the driver is put out
  94                          * of power-save due to TX and during suspend
  95                          * dynamic_ps_timer is cancelled and TX packet
  96                          * is flushed, leaving the driver in ACTIVE even
  97                          * after resuming until dynamic_ps_timer puts
  98                          * driver back in DOZE.
  99                          */
 100                         if (sdata->u.mgd.associated &&
 101                             sdata->u.mgd.powersave &&
 102                              !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
 103                                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 104                                 ieee80211_hw_config(local,
 105                                                     IEEE80211_CONF_CHANGE_PS);
 106                         }
 107                 }
 108
 109                 err = drv_suspend(local, wowlan);
 110                 if (err < 0) {
 111                         local->quiescing = false;
 112                         local->wowlan = false;
 113                         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
 114                                 mutex_lock(&local->sta_mtx);
 115                                 list_for_each_entry(sta,
 116                                                     &local->sta_list, list) {
 117                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 118                                 }
 119                                 mutex_unlock(&local->sta_mtx);
 120                         }
 121                         ieee80211_wake_queues_by_reason(hw,
 122                                         IEEE80211_MAX_QUEUE_MAP,
 123                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 124                                         false);
 125                         return err;
 126                 } else if (err > 0) {
 127                         WARN_ON(err != 1);
 128                         /* cfg80211 will call back into mac80211 to disconnect
 129                          * all interfaces, allow that to proceed properly
 130                          */
 131                         ieee80211_wake_queues_by_reason(hw,
 132                                         IEEE80211_MAX_QUEUE_MAP,
 133                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 134                                         false);
 135                         return err;
 136                 } else {
 137                         goto suspend;
 138                 }
 139         }
 140
 141         /* remove all interfaces that were created in the driver */
 142         list_for_each_entry(sdata, &local->interfaces, list) {
 143                 if (!ieee80211_sdata_running(sdata))
 144                         continue;
 145                 switch (sdata->vif.type) {
 146                 case NL80211_IFTYPE_AP_VLAN:
 147                 case NL80211_IFTYPE_MONITOR:
 148                         continue;
 149                 case NL80211_IFTYPE_STATION:
 150                         ieee80211_mgd_quiesce(sdata);
 151                         break;
 152                 case NL80211_IFTYPE_WDS:
 153                         /* tear down aggregation sessions and remove STAs */
 154                         mutex_lock(&local->sta_mtx);
 155                         sta = sdata->u.wds.sta;
 156                         if (sta && sta->uploaded) {
 157                                 enum ieee80211_sta_state state;
 158
 159                                 state = sta->sta_state;
 160                                 for (; state > IEEE80211_STA_NOTEXIST; state--)
 161                                         WARN_ON(drv_sta_state(local, sta->sdata,
 162                                                               sta, state,
 163                                                               state - 1));
 164                         }
 165                         mutex_unlock(&local->sta_mtx);
 166                         break;
 167                 default:
 168                         break;
 169                 }
 170
 171                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 172                 drv_remove_interface(local, sdata);
 173         }
 174
 175         /*
 176          * We disconnected on all interfaces before suspend, all channel
 177          * contexts should be released.
 178          */
 179         WARN_ON(!list_empty(&local->chanctx_list));
 180
 181         /* stop hardware - this must stop RX */
 182         ieee80211_stop_device(local);
 183
 184  suspend:
 185         local->suspended = true;
 186         /* need suspended to be visible before quiescing is false */
 187         barrier();
 188         local->quiescing = false;
 189
 190         return 0;
 191 }
 192
 193 /*
 194  * __ieee80211_resume() is a static inline which just calls
 195  * ieee80211_reconfig(), which is also needed for hardware
 196  * hang/firmware failure/etc. recovery.
 197  */
 198
 199 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 200                                     struct cfg80211_wowlan_wakeup *wakeup,
 201                                     gfp_t gfp)
 202 {
 203         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 204
 205         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 206 }
 207 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);